SRM1850 • SRM2850
1600W 18" POWERED SUBWOOFERS
O W N E R ’ S M A N U A L
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Contents
Features
Important Safety Instructions .................................. 2
• 1600W of intense power paired with custom
high-output 18" woofers for room-shaking,
chest-pounding low end performance
Contents................................................................. 3
Features................................................................. 3
Introduction............................................................ 4
How To Use This Manual ......................................... 4
Getting Started....................................................... 4
Things To Remember................................................ 4
Hookup Diagrams.................................................... 5
• “Built-Like-A-Tank” all-wood, internally-braced
cabinet delivers professional-grade road-
worthiness and near-zero distortion, even
at high volume
• Front ported for maximum low-frequency
extension and punch
SRM Subwoofer: Rear Panel Features ...................... 8
1. Power Connection ......................................... 8
2. Power Switch............................................... 8
3. XLR Inputs ................................................... 8
4. Normal / Invert Switch [Polarity].................. 9
5. Gain Knob & Sig / Lim LED............................ 9
6. High Pass Outputs ........................................ 9
7. Full Range Outputs........................................ 9
8. Stereo / Mono Switch [Full Range].............. 10
9. High Pass Mode.......................................... 10
10. Main Logo Switch ..................................... 10
11. Extra Knobs, Buttons and LEDs .................. 10
12. Rock ‘n Roll.............................................. 10
• Stereo XLR inputs plus stereo XLR full-range
and high-pass outputs
• Integrated digital crossover with variable
control and presets for SRM loudspeakers
• Smart Protect™ DSP kicks in to protect your
investment when things get pushed a little
too hard
• Built-in cup for easily pole-mounting full-range
loudspeakers
Placement............................................................. 11
The Ins and Outs of Polarity .................................. 11
Smart Protect ....................................................... 12
Limiting.......................................................... 12
Overexcursion Protection ................................ 12
Thermal Protection.......................................... 12
AC Power............................................................. 12
Care and Maintenance ........................................... 12
Please write your serial number here for future
reference (i.e., insurance claims, tech support,
return authorization, make dad proud, etc.)
Purchased at:
Appendix A: Service Information............................ 13
Appendix B: Connections ....................................... 14
Appendix C: Technical Information .......................... 15
SRM1850 Subwoofer Dimensions .................... 16
SRM1850 Subwoofer Frequency Response....... 16
SRM2850 Subwoofer Dimensions .................... 17
SRM2850 Subwoofer Frequency Response....... 17
SRM Subwoofer Block Diagram........................ 18
Date of purchase:
Limited Warranty.................................................. 19
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Part No. SW0986 Rev. B 06/14
©2014 LOUD Technologies Inc. All Rights Reserved.
3
Owner’s Manual
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Introduction
Getting Started
SRM 18" Powered Subwoofers are “Built-like-a-Tank,”
delivering 1600W of intense power in an ultra-high out-
put design that can shake the room. The professional-
grade, internally-braced all-wood enclosure provides
tour level road-worthiness with maximum low-frequen-
cy extension and punch.
The following steps will help you set up the
subwoofers quickly.
1. Make all initial connections with the power
switches OFF on all equipment. Make sure the master
volume, level, or gain controls are all the way down.
2. Connect the line-level outputs from the mixing
console (or other signal source) to the XLR inputs on
the rear panel of the SRM subwoofers.
SRM subwoofers feature stereo XLR inputs, full-range
and high-pass outputs plus a variable digital crossover
that includes presets for SRM top boxes.
3. Connect the high pass outputs from the SRM
subwoofers to the inputs of powered loudspeakers
(or to an amplifier powering passive loudspeakers).
The Smart Protect™ DSP is also in place to protect
your investment when things get pushed a little too
hard. Get the high-output, air-moving lows you demand
in a rock solid subwoofer with our proven performance.
4. Connect the supplied AC power cords to the
IEC sockets on the rear panel of each subwoofer.
Plug the other end into an AC outlet properly configured
with the correct voltage as indicated below the IEC
socket.
5. Turn the mixer (or other signal source) on.
6. Turn the subwoofers on.
7. Turn the loudspeakers on.
8. Start the signal source and raise the mixer’s
main L/R fader up until audio may be heard.
9. Adjust the master volume of the mixer to a
comfortably loud listening level.
10. Read the rest of this manual to learn how to set
the high pass mode to really dial in a sound for the
venue.
How to Use This Manual:
Things to Remember:
After this introduction, a getting started guide will
help you get things set up fast. The hookup diagrams
show some typical setups, while the remaining sections
provide details of the SRM subwoofers.
• Never listen to loud music for prolonged periods.
Please see the Safety Instructions on page 2 for
information on hearing protection.
This icon marks information that is critically
important or unique to the subwoofer. For
your own good, read and remember them.
• As a general guide, the mixer (or other signal
source) should be turned on first, subwoofers
next, and loudspeakers last. As such, the
loudspeakers should also be turned off first,
followed by the subwoofers, then the mixer.
This will reduce the possibility of any turn-on
or turn-off thumps and other noises generated
by any upstream equipment from coming out of
the speakers.
• Save the shipping boxes and packing materials!
You may need them someday. Besides, the
cats will love playing in them and jumping out at
you unexpectedly. Remember to pretend like you
are surprised!
4
SRM1850 • SRM2850 Powered Subwoofers
• Save your sales receipt in a safe place.
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Hookup Diagrams
SIG/OL
SIG/OL
SIG/OL
SIG/OL
SIG/OL
SIG/OL
MIC
MIC
MIC
MIC
(UNBALANCED)
L
L
TAPE
IN
TAPE
OUT
R
R
PROFESSIONAL MIC/LINE MIXER WITH FX
LINE
HI-Z
1
2
3/4
5/6
7/8
(MONO)
(MONO)
(MONO)
(MONO)
BAL
/
BAL
/
UNBAL
L
L
L
L
UNBAL
L
BAL
/
BAL
/
BAL
/
BAL
/
BAL
/
LINE/HIIN
1
LINE I
2
LINN
LINE IN
3
4
LINE I
LINE IN
6
LINE
8
UNBAL
UNBAL
UNBAL
UNBAL
MOSEND
UNBAL
FOOTSWITCH
BAL
UBAL
/
R
R
R
R
R
INSERT
U
INSERT
LINE IN
U
ST RETURN
FX SEND
MAIN OUT
PHONES
STEREO GRAPHIC EQ
U
POWER CONSUMPTION 200W
POWER CONSUMPTION 200W
LEVEL
SET
LEVEL
SET
LEVEL
SET
LEVEL
SET
15
10
15
10
48V
U
5
0
U
+
5
0
U
+5
0
U
5
-20 +20
GAIN
PHANTOM
POW
-20dB
+30dB
-20dB
+30dB
5
0
5
0
ER
GAIN
GAIN
GAIN
GAIN
LOW CUT
100Hz
SRM
550
LOW CUT
100 Hz
LOW CUT
100 Hz
LOW CUT
100 Hz
5
5
P
OWER
U
EQ
U
EQ
U
EQ
U
EQ
U
EQ 10
15
12kHz
10
15
H
I
H
I
H
I
H
I
HI
MAIN
12kHz
12kHz
12kHz
12kHz
METERS
125
250
500
1K
2K
4K
8K
SRM
650
0dB=0dBu
-15 5
U
-15 +15
U
-15 +15
U
-15 +
U
-15 +15
U
OL
15
10
6
MAIN MIX
MON
EQ IN
BYPASS
M
I
D
H
M
I
D
H
M
I
D
H
M
I
D
H
MID
2.5 Hz
2
.
5k
z
2
.
5k
z
2
.
5k
z
2
.
5k
z
k
-15 +15
U
-15 +15
U
-15 +15
U
-15 +15
U
-15 +15
U
3
USB
0
VAR
L
O
W
L
O
W
L
O
W
L
O
W
LOW
80Hz
FX PRESETS
80Hz
80Hz
80Hz
80Hz
2
0
1
B
R
I
G
H
T
ROOM
4
0
2
W
A
R
M
LOUNGE
-15 +15
U
-15 +15
U
-15 +15
U
-15 +15
U
-15 +15
U
U
0
3
S
M
A
L
L
S
T
A
G
E
7
0
4
W
A
R
M
T
H
E
A
TER
AUX
MON
AUX
MON
AUX
MON
AUX
MON
AUX
MON
05
W
A
R
M
H
A
L
L
10
20
30
0
6
C
O
N
C
E
R
T
HALL
0
7
P
C
L
A
A
T
E
REVERB
O
O
+20
08
THEDRAL
0
9
CHORUS
INPUT LEVEL
L
R
O
O
U
+15
O
O
U
+15
O
O
U
+15
O
O
U
+15
O
O
U
+15
1
0
C
H
O
R
U
S
+
REV
PRESETS
11
DOUBLER
12
T
A
P
E
S
LAP
1
3
D
E
L
L
L
A
A
A
Y
Y
Y
1
2
3
(
3
8
8
0
0
0
0
m
m
m
s
s
s
)
)
)
MUTE
FX
FX
FX
FX
FX
1
4
D
E
(
3
15
DE
(
4
USB THRU
BREAK
O
O
+15
O
O
+15
O
O
+15
O
O
+15
O
O
+15
16
R
E
V
E
R
B
+
D
L
Y
(250ms)
(MUTES ALL CHANNELS)
PAN
PAN
PAN
PAN
PAN
U
U
U
OL
O
O
+15
O
O
PHO ONES
T
L
R
L
R
L
R
L
R
L
R
O
O
+15
O
MAX
+20
APE LEVEL
FX MASTER
FX TO MON
MUTE
MUTE
MUTE
3/4
MUTE
5/6
MUTE
7/8
MUTE
OL
MON
MAIN
dB
OL
OL
OL
OL
OL
1
2
ST RTN
FX RTN
dB
10
dB
10
dB
10
dB
10
dB
10
dB
10
dB
10
dB
10
10
5
5
5
5
5
5
5
5
5
U
5
U
5
U
5
U
5
U
5
U
5
U
5
U
5
U
5
10
10
10
10
10
10
10
10
10
20
30
20
30
20
30
20
30
20
30
20
30
20
30
20
30
20
30
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
40
50
60
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
SRM
550
SRM
650
VAR
POWER CONSUMPTION 200W
In this example, an SRM1850 subwoofer is connected to two SRM650 loudspeakers. It is a perfect setup
for a small club.
Here, the L/R outputs of a ProFX8 mixer are connected directly to the channel A and B inputs of a single
SRM1850 subwoofer.
The channel A and B high pass outputs of the SRM1850 subwoofer are connected directly to the channel
1 inputs of each SRM650 loudspeaker. Be sure that the gain knob on each is set to “line” or get ready to
be blasted! Select the SRM650 high pass mode on the SRM1850 for a matched system.
Small Club System
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Hookup Diagrams continued...
SIG/OL
SIG/OL
SIG/OL
SIG/OL
SIG/OL
SIG/OL
SRM
650
SRM
750
VAR
SRM
650
SRM
650
SRM
750
SRM
750
VAR
VAR
POWER CONSUMPTION 200W
POWER CONSUMPTION 200W
SRM
650
SRM
650
SRM
750
SRM
750
VAR
VAR
POWER CONSUMPTION 200W
POWER CONSUMPTION 200W
Feel the awesome power! In this example, a pair of SRM2850 subwoofers line each side of the venue...
four subs total! The top sub on each side is connected to an SRM750 loudspeaker. This fully powered PA
is desired when you really need a slammin’ system with deep, commanding lows and nice, crisp highs.
Here, the L/R outputs of a DL1608 mixer are connected directly to the channel A input of each
bottom SRM2850 subwoofer. The channel A full range output of each (bottom) SRM2850 subwoofer
is connected directly to the channel 1 input of each (top) SRM2850 subwoofer.
From here, the channel A high pass output of each (top) SRM2850 subwoofer is connected directly to the
channel 1 input of each SRM750 loudspeaker. Be sure that the gain knob on each is set to “line” or get
ready to be blasted! Select the SRM750 high pass mode on the SRM2850 for a matched system.
***Please note that the SRM750 loudspeakers are stacked on top of the SRM2850 subwoofers, not
pole-mounted. SRM750s may be pole-mounted on a tripod stand, but must be stacked on subwoofers.
BIG PA
6
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Hookup Diagrams continued...
To next SRM
subwoofer
input
To next SRM
subwoofer
input
Main
Outs
SRM
550
SRM
550
SRM
550
SRM
550
SRM
650
SRM
650
SRM
650
SRM
650
VAR
VAR
VAR
VAR
DL1608 Mixer
SRM subwoofers may be daisy-chained via the male XLR connector labeled “FULL RANGE”. Simply plug
the signal source (i.e., mixer output) into the input jack(s), and patch that subwoofer’s full range jack
to the next subwoofers’s input jack, and so on, daisy-chaining multiple SRM subwoofers. See above
for a visual representation of daisy-chaining.
Daisy-Chaining Multiple SRM Subwoofers
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SRM Subwoofer: Rear Panel Features
9
2.Power Switch
SRM
550
Press the top of this rocker switch inwards to turn on
the subwoofer. The front panel Running Man logo will
glow with happiness...or at least it will if the subwoofer
is plugged into a suitable live AC mains supply and the
main logo switch [10] is disengaged.
SRM
650
5
VAR
10
7
4
8
Press the bottom of this rocker switch inwards to turn
off the subwoofer.
3
6
As a general guide, the mixer (or other signal
source) should be turned on first, SRM
subwoofers next, and loudspeakers last.
As such, the loudspeakers should also be turned off first,
followed by the subwoofers, then the mixer. This will
reduce the possibility of any turn-on or turn-off thumps
and other noises generated by any upstream equipment
from coming out of the speakers.
3.XLR Inputs
Balanced XLR female connectors are provided for the
left and right inputs. Connect the full-range line-level
signal from the mixer (or other signal source) to these
input jacks.
If you are connecting a single subwoofer output, or
LFE (low-frequency effects) output to the subwoofer,
you may use either the A or B input connector.
11
NEVER connect the output of an amplifier
directly to the input of the subwoofer.
This could damage the input circuitry of the
active subwoofer.
They are wired as follows, according to standards
specified by the AES (Audio Engineering Society):
Balanced XLR Input Connector
Pin 1 – Shield (ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
2
1
2
SHIELD
COLD
POWER CONSUMPTION 200W
HOT
1.Power Connection
1
3
SHIELD
COLD
HOT
This is a standard 3-prong IEC power connector.
Connect the detachable power cord (included in
the packaging with the subwoofer) to the power
receptacle, and plug the other end of the power
cord into an AC outlet.
1
3
2
Balanced XLR Input Connector
Make sure that the AC power is matched to
the AC power indicated on the rear panel
(below the IEC receptacle).
For more information on these connectors, see
Appendix B on page 14.
Disconnecting the plug’s ground pin is
dangerous. Don’t do it!
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SRM Subwoofer: Rear Panel Features continued...
4. Normal/Invert Switch [Polarity]
This switch reverses the polarity of the signal going
into the subwoofer amplifier by 180˚. It has no effect on
the signal at the outputs.
5
There is no right or wrong setting for this switch.
4
Listen to the overall blend of the subwoofer with
the rest of the system and select the switch position
that gives you the best sound for your audience.
In fact, your system may vary when positioned
differently and in alternate venues. Don’t be afraid
to experiment with the position of the polarity switch.
See page 11 for more information.
6
7
5. Gain Knob & Sig / Lim LED
The gain knob adjusts the input sensitivity of the
mic inputs. This allows signals from the outside world
to be adjusted to run through each channel at optimal
internal operating levels. There is –6 dB of gain with the
knob fully down (off), ramping up to 6 dB of gain fully
up (max).
They are wired as follows, according to standards
specified by the AES (Audio Engineering Society):
Balanced XLR Output Connector
Pin 1 – Shield (ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
The accompanying dual-colored LED will illuminate
green when the input signal is present, indicating
signal. It will remain lit so long as there is signal above
–20 dBu present.
SHIELD
1
3
COLD
3
2
HOT
SRM subwoofers have a built-in limiter that
helps to prevent the amplifier outputs from clipping
or overdriving the transducers. The LED illuminates
yellow when the limiter is activated. It’s okay for it
to blink yellow occasionally, but if it blinks frequently
or lights continuously, turn down the gain knob until
it only blinks occasionally.
SHIELD
COLD
HOT
1
2
Balanced XLR Output Connector
7. Full Range Outputs
Excessive limiting may lead to
overheating, which in turn trips the
thermal protect circuitry and interrupts
the performance. See ‘Thermal Protection’ on
page 12 for more information.
Connect the full range outputs to the inputs of
another powered subwoofer, powered loudspeakers,
or to an amplifier powering passive loudspeakers.
Balanced XLR male connectors are provided for the
line-level A and B full range outputs.
The signal at these outputs is a direct copy of the
input signals. These outputs allow you to daisy-chain
multiple subwoofers and/or send the full range signals
to loudspeakers. It’s a great way to add side fills, too!
6. High Pass Outputs
Typically, full-range loudspeakers are connected
to the high pass outputs to “split” the work with
the subwoofer. The subwoofer handles all of the low
frequencies and the loudspeakers handle the rest.
As a result, it is more efficient and a bit louder.
Balanced XLR male connectors are provided
for the line-level A and B high pass outputs.
The subwoofer’s crossover splits the input signals into
two frequency bands. The low frequency range below
20 Hz – 200 Hz goes to the internal amplifier that
powers the subwoofer. The frequency range above
20 Hz – 200 Hz is sent to these line-level output jacks.
The frequency range depends on where the high pass
mode [9] is set.
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SRM Subwoofer: Rear Panel Features continued...
Frequencies below the crossover frequency are sent
SRM
550
to the subwoofer. Additionally, the SRM loudspeaker
presets apply alignment delay to the subwoofer creating
an optimally aligned 3-way system. Frequencies above
the selected crossover frequency are sent to the high
pass outputs [6]. The high pass mode should be set
to the lowest frequency response rating of the main
loudspeakers. Press the high pass mode button
repeatedly until the desired high pass mode setting
LED illuminates. If “variable” is selected, turn the high
pass mode knob to the frequency you desire.
SRM
650
VAR
9
10
8
They are wired as follows, according to standards
specified by the AES (Audio Engineering Society):
SRM550 – 115 Hz plus alignment delay
SRM650 – 115 Hz plus alignment delay
SRM750 – 115 Hz plus alignment delay
VAR – 60 Hz – 120 Hz
Balanced XLR Output Connector
Pin 1 – Shield (ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
10. Main Logo Switch
SHIELD
1
The Running Man logo on the front of the subwoofer
illuminates when this switch is disengaged and AC
power is available at the mains input [1]. Engage
the switch if you do not want the Running Man logo
to illuminate.
3
COLD
3
2
HOT
SHIELD
COLD
HOT
1
2
11. Extra Knobs, Buttons and LEDs
Balanced XLR Output Connector
What’s cooler than extra bells and whistles on a new
toy? Well, a lot of things, I suppose, but that didn’t stop
us! The rear panel of each SRM subwoofer is stacked
with a variety of extra knobs, buttons and LEDs. We ran
out of time, so we’re not really sure what any of them
does. Go ahead and experiment with each knob and
button. Once you have an idea of what each feature is
used for, be sure to drop us a line to let us know. We can
revise the manual with this newfound knowledge, all
thanks to you!
See page 7 to learn more about daisy-chaining SRM
loudspeakers.
For more information on these connectors, see
Appendix B on page 14.
8. Stereo/Mono Switch [Full Range]
This switch allows you to choose whether the
A and B inputs are sent out separately [switch out] or
as a mono sum of both inputs [switch in].
For example, if a mixer’s L/R outputs are connected
to the A and B inputs of an SRM subwoofer and the full
range outputs are connected to strategically placed
SRM loudspeakers, engage the switch so the signal is
mono-summed. Otherwise, you’ll get just the left or
right signal from the mixer’s output sent from the A
and B full range outputs to the SRM loudspeakers.
11
12. Rock ‘n Roll
9. High Pass Mode
Congratulations, you have reached the end of
the features section! At this point, you should have
a pretty good understanding of how the SRM subwoofer
functions. If this is true, the next step is to rock ‘n roll!
If this is not true, head back to page 8 and read
it all over again. The following pages discuss SRM
placement, an in-depth look at polarity and Smart
Protect, technical information and more. Check it out!
The high pass mode allows you to choose from a list
of presets for SRM loudspeakers, as noted below.
This optimizes the subwoofer and loudspeakers
connected to the SRM high pass outputs. If not using
SRM loudspeakers, a variable mode allows you to select
the best high pass mode suited for your PA system from
60 Hz to 120 Hz.
10
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Placement
The Ins and Outs of Polarity
SRM subwoofers are designed to sit on the floor
or stage. They are not designed to be pole-mounted
or suspended.
SRM subwoofers include a switch that allows you to
quickly invert the polarity of the subwoofer’s output
relative to the input signal it is receiving from the
mixer or other sound source. But what exactly does that
mean? A subwoofer works by literally pumping air as
the woofer cone moves in and out with respect to the
cabinet in which it is housed. It does so according to the
low-frequency portion of the signal it receives from the
sound source.
When pole-mounting loudspeakers, be sure that
the subwoofers are stabilized and secured from falling
over or being accidentally pushed over.
Please note that SRM750 loudspeakers
should be stacked, not pole-mounted.
Failure to follow these precautions may result
in damage to the equipment, personal injury, or death.
The woofer cone is simply following the waveform as
seen in the sine wave in Figure 1. As the sine wave rises,
the woofer cone pushes out. Likewise, as the sine wave
falls, the woofer cone pulls into the cabinet. A musical
signal is much more complex, of course, but the same
principle applies. Movement of the woofer cone causes
air pressure changes that we perceive as sound.
Speaking of stacking, SRM2850 subwoofers have
footholes located on the top of each cabinet. While we
realize that crowds will fall head over heels at their
beauty, believe it or not, these footholes do indeed serve
a purpose.
When the normal/invert [polarity] switch [4] is
engaged, the original waveform is simply reversed 180˚
[see Figure 2]. Again, the subwoofer cone follows the
waveform. However, this time the woofer cone starts
by pulling into the cabinet followed by the woofer cone
pushing out. If you have ever experimented with a
subwoofer polarity switch, you may not have noticed
any changes to the sound regardless of its position,
especially if you are listening to just the subwoofer.
This is normal, as our ears perceive them both at the
same time.
Should you decide to stack an additional SRM2850 –
creating a monster PA – the feet located on the bottom
of each subwoofer line up nicely with the footholes
located on the top of each subwoofer. The same can be
said of the four feet of an SRM750 and the four footholes
located near the center of the SRM2850.
For either of these stacked scenarios, it is highly
suggested that straps are utilized. To reiterate, failure
to follow these precautions may result in damage to
the equipment, personal injury, or death.
These cabinets have no rigging points and
are not suitable for rigging. NEVER attempt
to suspend an SRM subwoofer by its handles.
The normal/invert [polarity] switch comes into play
when the subwoofer is paired with a loudspeaker.
Ideally, the woofer cones of the subwoofer and full
range loudspeaker would work together by pushing
and pulling in unison. SRM subwoofers are designed to
be used in a broad range of applications. The flexibility
provided by the polarity switch is necessary to ensure
that you are receiving the best possible sound from
your system, regardless of your setup.
Polarity Waveforms
Figure 1: Normal [0˚]
<–– Time ––>
Figure 2: Invert [180˚]
<–– Time ––>
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Smart Protect
AC Power
There are advanced DSP protection mechanisms
to safeguard the subwoofers and amplifiers from
inadvertent damage.
Be sure the subwoofer is plugged into an outlet that
is able to supply the correct voltage specified for your
model. It will continue to operate at lower voltages,
but will not reach full power.
The protection circuits are designed to
protect the subwoofers under reasonable
and sensible conditions. Should you choose
Be sure the electrical service can supply enough
amperage for all the components connected to it.
to ignore the warning signs [e.g. excessive distortion],
you can still damage the speaker in the subwoofer
by overdriving it past the point of amplifier clipping.
Such damage is beyond the scope of the warranty.
We recommend that a stiff (robust) supply of AC
power be used because the amplifiers place high
current demands on the AC line. The more power that is
available on the line, the louder the speakers will play
and the more peak output power will be available for a
cleaner, punchier bass. A suspected problem of “poor
bass performance” is often caused by a weak AC supply
to the amplifiers.
Limiting
The driver has its own compression circuit which
helps protect it from damaging transient peaks.
The compressor is designed to be transparent and
is not noticeable under normal operating conditions.
Never remove the ground pin on the power
cord or any other component of the SRM
subwoofer. This is very dangerous.
Overexcursion Protection
The SRM1850 has a 24 dB/octave high-pass filter
at 30 Hz, while the SRM2850 has a 24 dB/octave
high-pass filter at 32 Hz just prior to the low-frequency
amplifier. This prevents very low frequencies from being
amplified. Excessive low-frequency energy can damage
the woofer by causing it to “bottom out,” also know
as overexcursion, which is equivalent to a mechanical
form of clipping.
Care and Maintenance
SRM subwoofers will provide many years of reliable
service if you follow these guidelines:
•
Avoid exposing the subwoofers to moisture.
If they are set up outdoors, be sure they are
under cover if rain is expected.
•
Avoid exposure to extreme cold (below
freezing temperatures). If you must operate
the subwoofers in a cold environment, warm
up the voice coils slowly by sending a low-level
signal through them for about 15 minutes prior
to high-power operation.
Thermal Protection
All amplifiers produce heat. SRM subwoofers are
designed to be efficient both electrically and thermally.
In the unlikely event of the amplifier overheating,
a built-in thermal switch will activate, muting the
signal.
•
Use a dry cloth to clean the cabinets. Only do
this when the power is turned off. Avoid getting
moisture into any of the openings of the
cabinet, particularly where the drivers are
located.
When the amplifier has cooled down to a safe
operating temperature, the thermal switch resets
itself, and the subwoofer resumes normal operation.
If the thermal switch activates, try turning down the
level control a notch or two on the mixing console (or
the back of the subwoofer) to avoid overheating the
amplifier. Be aware that direct sunlight and/or hot stage
lights may be the culprit of an amplifier overheating.
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Appendix A: Service Information
If you think your subwoofer has a problem, please
check out the following troubleshooting tips and do
your best to confirm the problem. Visit the Support
will find lots of useful information such as FAQs and
other documentation. You may find the answer to the
problem without having to part with your subwoofer.
Poor bass performance
• Check the polarity of the connections between the
mixer and the subwoofers. You may have your
positive and negative connections reversed at one
end of one cable, causing one subwoofer to be
out-of-phase with the other.
• Poor bass performance may be the result of bad
AC power. See the section titled ‘AC Power’ on
the previous page for further details.
Troubleshooting
No power
Poor sound
• Our favorite question: Is it plugged in? Make sure
the AC outlet is live [check with a tester or lamp].
• Is it loud and distorted? Make sure that you’re not
overdriving a stage in the signal chain. Verify that
all level controls are set properly.
• Our next favorite question: Is the power switch
on? If not, try turning it on.
• Is the input connector plugged completely into
the jack? Be sure all connections are secure.
• Make sure the line cord is securely seated in the
line cord socket and plugged all the way into the
AC outlet.
Noise
• Is the Running Man logo on the front panel
illuminated? If not, make sure the AC outlet
is live. If so, refer to “No sound” below.
• Make sure all connections to the active
subwoofers are good and sound.
• Make sure none of the signal cables are routed
near AC cables, power transformers, or other
EMI-inducing devices.
• The internal AC line fuse may be blown. This is
not a user serviceable part. If you suspect the
AC line fuse is blown, please see the "Repair"
section next.
• Is there a light dimmer or other SCR-based
device on the same AC circuit as the subwoofer?
Use an AC line filter or plug the subwoofer into
a different AC circuit.
No sound
• Is the input gain knob for the input source
turned all the way down? Verify that all the volume
controls in the system are properly adjusted.
Look at the level meter to ensure that the mixer
is receiving a signal.
Hum
• Try disconnecting the cable connected to the
input jack. If the noise disappears, it could
be a “ground loop,” rather than a problem with
the subwoofer. Try some of the following
troubleshooting ideas:
• Is the signal source working? Make sure the
connecting cables are in good repair and securely
connected at both ends. Make sure the output
level control on the mixing console is turned up
sufficiently to drive the inputs of the speaker.
• Use balanced connections throughout your system
for the best noise rejection.
• Make sure the mixer does not have a mute on or a
processor loop engaged. If you find something like
this, make sure the level is turned down before
disengaging the offending switch.
• Whenever possible, plug all the audio equipment’s
line cords into outlets which share a common
ground. The distance between the outlets and the
common ground should be as short as possible.
• Has it shut down? Make sure there is at least
six inches of free space behind each subwoofer.
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Repair
For warranty service, refer to the warranty
information on page 19.
Non-warranty service is available at a factory-
authorized service center. To locate the nearest
Tech Support” and select “Locate a Service Center
or Distributor” [3]. Service for SRM subwoofers living
outside the United States can be obtained through local
dealers or distributors.
If you do not have access to our website, you may call
the Tech Support department at 1-800-898-3211,
Monday-Friday, during normal business hours, Pacific
Time, to explain the problem. Tech Support will tell you
where the nearest factory-authorized service center is
located in your area.
Appendix B: Connections
Balanced XLR Input Connector
Balanced XLR Output Connector
Each SRM subwoofer has two female XLR inputs. Be
sure the cables are wired per AES (Audio Engineering
Society) standards:
There are also four male balanced XLR output
connectors on each SRM subwoofer [two high pass
and two full range]. Be sure the cables are wired
per AES (Audio Engineering Society) standards:
Balanced XLR Input Connector
Pin 1 – Shield (Ground)
Balanced XLR Output Connector
Pin 1 – Shield (Ground)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
Pin 2 – Positive (+ or hot)
Pin 3 – Negative (– or cold)
2
SHIELD
HOT
SHIELD
1
1
3
COLD
3
COLD
3
2
SHIELD
COLD
HOT
HOT
1
SHIELD
COLD
HOT
1
3
2
2
Balanced XLR Input Connector
Balanced XLR Output Connector
SRM subwoofers may be daisy-chained via the male
XLR connector labeled “FULL RANGE”. Simply plug the
signal source (i.e., mixer output) into the
input jack(s), and patch that subwoofer’s full range
jack to the next subwoofer’s input jack, and so on,
daisy-chaining multiple SRM subwoofers. See
page 7 for a visual representation of daisy-chaining.
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Appendix C: Technical Information
SRM Subwoofer Specifications
Acoustic Performance:
Safety Features
Frequency Response (–3 dB)
40 Hz – 120 Hz [SRM1850] Input Protection
34 Hz – 100 Hz [SRM2850]
Peak and RMS limiting,
power supply and amplifier
thermal protection
Frequency Response (–10 dB)
Max peak SPL
35 Hz – 150 Hz [SRM1850]
26 Hz – 145 Hz [SRM2850] Display LEDs
Defeatable front power ON
(Running Man logo), Front load
power limiter, High Pass Mode,
input signal
132 dB [SRM1850]
135 dB [SRM2850]
Crossover Point
115 Hz plus alignment delay [SRM550]
115 Hz plus alignment delay [SRM650]
115 Hz plus alignment delay [SRM750]
60 Hz – 120 Hz [Variable]
Construction Features
Cabinet
18 mm Poplar plywood
Slope
3rd order HP, 4th order LP
Finish
High durability black paint
Handles
One on each side [SRM1850]
Two on each side [SRM2850]
Grille
Powder-coated 16 gauge steel
Transducer
Woofer Diameter
18 in / 457 mm
3.0 in / 76 mm
Voice Coil Diameter
Physical Properties
Subwoofer Diaphragm Material
Magnet Material
Paper
SRM1850:
Height
Width
22.5 in / 572 mm
22.2 in / 565 mm
23.9 in / 608 mm
64 lb / 29 kg
Ferrite
Depth
Weight
SRM2850:
Height
24.5 in / 623 mm
44.0 in / 1117 mm
24.0 in / 610 mm
29.5 in / 750 mm
144 lb / 65.2 kg
Power Amplifier
Rated Power
Width
800 watts rms
1600 watts peak
Depth (without casters)
Depth (with casters)
Weight
Rated THD
Cooling
< 1%
Convection
Class D
Design
Mounting Methods
SRM subwoofers are designed to sit on the floor or stage.
They are NOT designed to be pole-mounted or suspended.
The cabinet has no rigging points and is not suitable for rigging.
Never attempt to suspend an SRM subwoofer by its handles.
Input/Output
Input Type
Female XLR balanced
differential (stereo left/right)
Options
SRM1850 Cover
Input Impedance
Full Range Outputs
High Pass Outputs
20 k balanced,
10 k unbalanced
P/N 2036809-24
P/N 2036809-27
P/N 2035170-01
Male XLR balanced
(parallel with inputs – mono)
SRM2850 Cover
SPM200 Loudspeaker Pole Mount
Male XLR balanced
Disclaimer
Since we are always striving to make our products better by
incorporating new and improved materials, components, and
manufacturing methods, we reserve the right to change these
specifications at any time without notice.
Line Input Power
US detachable line cord
EU detachable line cord
AC Connector
100 – 120 VAC, 50 – 60 Hz, 200W
200 – 240 VAC, 50 – 60 Hz, 200W
3-pin IEC 250 VAC
The “Running Man” figure is a registered trademark of LOUD
Technologies Inc.
All other brand names mentioned are trademarks or registered
trademarks of their respective holders, and are hereby
acknowledged.
Power Supply Type
Switchmode
©2014 LOUD Technologies Inc.
15
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SRM1850 Subwoofer Dimensions
WEIGHT
64 lb
29 kg
22.5 in
572 mm
22.2 in
565 mm
22.0 in
23.9 in
608 mm
22.8 in
558 mm
579 mm
23.9 in
16.8 in
428 mm
608 mm
SRM1850 Subwoofer Frequency Response
+10
+0
SRM550 / SRM650
VARIABLE : HIGH
VARIABLE : LOW
-10
-20
-30
20
200
2000
20000
Frequency Response [Hz]
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SRM2850 Subwoofer Dimensions
WEIGHT
144 lb
65.2 kg
24.5 in
623 mm
44.0 in
1117 mm
24.0 in
610 mm
38.4 in
29.5 in
750 mm
976 mm
SRM2850 Subwoofer Frequency Response
+10
+0
SRM650
SRM750
-10
VARIABLE : 60 Hz
VARIABLE : 120 Hz
-20
-30
200
2000
20
20000
Frequency Response [Hz]
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SRM Subwoofer Block Diagram
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Limited Warranty
Please keep your sales receipt in a safe place.
This Limited Product Warranty (“Product Warranty”) is provided by LOUD Technologies Inc. (“LOUD”)
and is applicable to products purchased in the United States or Canada through a LOUD-authorized
reseller or dealer. The Product Warranty will not extend to anyone other than the original purchaser
of the product (hereinafter, “Customer,” “you” or “your”).
For products purchased outside the U.S. or Canada, please visit www.720trees.com to find contact
information for your local distributor, and information on any warranty coverage provided by the
distributor in your local market.
LOUD warrants to Customer that the product will be free from defects in materials and workmanship
under normal use during the Warranty Period. If the product fails to conform to the warranty then LOUD
or its authorized service representative will at its option, either repair or replace any such nonconforming
product, provided that Customer gives notice of the noncompliance within the Warranty Period to the
Company at: www.720trees.com or by calling LOUD technical support at 1.800.898.3211 (toll-free in
the U.S. and Canada) during normal business hours Pacific Time, excluding weekends or LOUD holidays.
Please retain the original dated sales receipt as evidence of the date of purchase. You will need it to obtain
any warranty service.
For full terms and conditions, as well as the specific duration of the Warranty for this product, please
visit www.720trees.com.
The Product Warranty, together with your invoice or receipt, and the terms and conditions located at
www.720trees.com constitutes the entire agreement, and supersedes any and all prior agreements
between LOUD and Customer related to the subject matter hereof. No amendment, modification or
waiver of any of the provisions of this Product Warranty will be valid unless set forth in a written
instrument signed by the party to be bound thereby.
Need help with the subwoofer?
• Telephone 1-800-898-3211 to speak with one of our splendid technical support chaps
(Monday through Friday, normal business hours, Pacific Time).
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16220 Wood-Red Road NE
Woodinville, WA 98072 • USA
Phone: 425.487.4333
Toll-free: 800.898.3211
Fax: 425.487.4337
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